0a2a08739e5ee13a20ba5d874beca4958a42cb49
As part of its built-in mmap emulation support for "none" file system services, libfsdriver clears the VM cache upon exit. However, for trivial file systems which do not even support reading from files, the the VM cache need to be cleared either. With this patch, the VM cache is cleared only when modified, so that such trivial file systems need not be given CLEARCACHE permission. Change-Id: I518c092443455302b9b9728f10a3f894d2c8036b
Description
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